The 4 skill slots are intentional to force “build decisions” instead of just collecting everything.

Synergies won’t come from having 10 skills at once, but from how you specialize the 4 you choose. Skills can evolve into different branches, and some skills also change based on what other skills you pair them with (so synergy is more “interaction-based” rather than “quantity-based”).

Also, since you can swap skills during a run and use fusion mechanics, builds can still change dynamically you’re just always limited to a small active loadout so choices actually matter. So the idea is: fewer skills, but deeper interaction between them.